Welcome to Healing well, miss T,
Are you working with an endo for your thyroid issues? Did she/he do a full panel blood work up? If not ask her/him too. Let her/him know what you are feeling and are wondering if you could be low in b-12, iron or vitamin D. I am sure she/he would be willing. Most people that live in northern,cold climates are lacking in Vitamin D and a deficiency in it, or any of the others, could leave you very weak and fatigued.
Hope you get an answer soon. please, keep us posted.
Rheumatoid arthritis, Fibromyalgia, meniscus tears in left knee, Cancer survivor